[cjacky]

I'm looking forward on getting a catless downpipe. Since Jb4's latest firmware doesn't delete CEL is there any other way of getting rid of it besides getting the car tuned? Would i also need a charge pipe with the downpipe?

[MONSTAR]

Please try searching a little bit next time. There are literally two posts about this on the first page of this sub.

http://f30.bimmerpost.com/forums/sho....php?t=1424289

http://f30.bimmerpost.com/forums/sho....php?t=1424755

An ECU tune can remove it and there are o2 simulators out there that could remove it.

[DanM2C]

I'm also selling a JB4 in the classified section that still has the old firmware if that is the route you want to take

[MONSTAR]

Originally Posted by Jacky Chan

I'm looking forward on getting a catless downpipe. Since Jb4's latest firmware doesn't delete CEL is there any other way of getting rid of it besides getting the car tuned? Would i also need a charge pipe with the downpipe?

Also, no you do not need a charge pipe to run a downpipe. Many people get one as a security as the stock charge pipe is plastic and prone to cracking. I don't know the actual number of broken stock charge pipes on the N20/N26 however, it seems to be more of an issue with the N55 crowd.

As an anecdote, I haven't any problems with my stock charge pipe on JB4 Map 1 and catless downpipe....yet

[LiquidMercury]

You'll want a CP if you're going to run Map 2 off the JB4 as you're pushing more boost through the stock CP otherwise if you leave it stock. Numerous posts here and around the web where users ran Map 2 with a stock CP and it cracked. Map 1 as MONSTAR stated should be ok. I upgraded my CP just to be on the cautious side as my ride is my only one and downtime to having it fixed if I didn't replace it isn't something I could afford time-wise. I also upgraded my FMIC as well.